Bobcat 753 leaking around throttle control

[Rutdipper]

Hello, I have a Bobcat 753 that’s leaking around the “Shaft” that all the throttle control arm/linkage connects to at the back of the engine. It’s spitting fluid up around the shaft & also their is quite a bit of side to side play on the shaft. Any ideas on what parts or seals I’m needing. Also I don’t have a service manual so any part #’s are seal/rebuild kit descriptions would be awesome! Thank you!! Scott

 

[David88]

Yep, it's the drive motor. Which one, I'd pull them both and inspect them, you'll usually be able to tell which one has failed. I'm not certain about the 753, but many Bobcats have a sprocket shaft carrier housing that the motor bolts on to. When the motor fails and pressurizes that case, it will blow the seal out in the shaft carrier housing, pretty easy to see. Gauge console probably has a backlight not working, haven't replaced one before, don't really know what type of lamp is in there. OR I find it more safe to follow a manual.. For me I trust reliable-store.com .. since you don't have a manual I believe it's a good start

 

[Rutdipper]

Yep, it's the drive motor. Which one, I'd pull them both and inspect them, you'll usually be able to tell which one has failed. I'm not certain about the 753, but many Bobcats have a sprocket shaft carrier housing that the motor bolts on to. When the motor fails and pressurizes that case, it will blow the seal out in the shaft carrier housing, pretty easy to see. Gauge console probably has a backlight not working, haven't replaced one before, don't really know what type of lamp is in there. OR I find it more safe to follow a manual.. For me I trust reliable-store.com .. since you don't have a manual I believe it's a good start

Hello thanks for reply...but I think we’re talking about 2 different things. I’m leaking pretty sure diesel around a small 2” shaft that sticks out of small unit at the front of the motor (front meaning when I open the back hatch it’s right there) the throttle lever & linkage in the cab connect to it. When you throttle up & down it rotate the shaft....my shaft has side to side play and has fluid seeping out around the shaft.

 

[Bswwood]

Hello thanks for reply...but I think we’re talking about 2 different things. I’m leaking pretty sure diesel around a small 2” shaft that sticks out of small unit at the front of the motor (front meaning when I open the back hatch it’s right there) the throttle lever & linkage in the cab connect to it. When you throttle up & down it rotate the shaft....my shaft has side to side play and has fluid seeping out around the shaft.

You should be leaking oil from that seal and not diesel. That shaft is your governor control or speed control. You have two nuts threaded on it and you use the nuts to adjust the friction or shaft play, if you loosen the jam nut and tighten the bottom nut you will see how it will take the slop out of your shaft. There is an o-ring and friction ring below the throttle lever, back off the two nuts and pry up on the lever with a screwdriver or small pry bay and tap the shaft with a small hammer and it should pop off, leave the nuts on while hitting it so you dont damage the threads. You will see the lever is keyed, remove the key and you will find the o-ring and friction washer. The friction washer may be reusable and all you need is an o-ring to seal it from leaking, put it back together and set the tension with the two nuts. Its really east to do, just a little tricky to get the throttle lever to pop off. You should be able to match up the o-ring at the hardware store or if you go to bobcat you need 3966512 o-ring and also get the 3974644 friction washer.

 

[Rutdipper]

You should be leaking oil from that seal and not diesel. That shaft is your governor control or speed control. You have two nuts threaded on it and you use the nuts to adjust the friction or shaft play, if you loosen the jam nut and tighten the bottom nut you will see how it will take the slop out of your shaft. There is an o-ring and friction ring below the throttle lever, back off the two nuts and pry up on the lever with a screwdriver or small pry bay and tap the shaft with a small hammer and it should pop off, leave the nuts on while hitting it so you dont damage the threads. You will see the lever is keyed, remove the key and you will find the o-ring and friction washer. The friction washer may be reusable and all you need is an o-ring to seal it from leaking, put it back together and set the tension with the two nuts. Its really east to do, just a little tricky to get the throttle lever to pop off. You should be able to match up the o-ring at the hardware store or if you go to bobcat you need 3966512 o-ring and also get the 3974644 friction washer.

Awesome!! Thank you very much Bswwood! That answers all my question in one reply. Yea I wasn’t sure if it was oil or diesel. I have a small oil leak somewhere else & by the time the fluid runs down it’s mixed & hard for me to tell. Thanks again!

 

[Tazza]

Awesome!! Thank you very much Bswwood! That answers all my question in one reply. Yea I wasn’t sure if it was oil or diesel. I have a small oil leak somewhere else & by the time the fluid runs down it’s mixed & hard for me to tell. Thanks again!

I have replaced this Oring before, fairly simple job.
When you take the plate off, it will not just come out on it's own, it will have 2 springs attached to tle lever. I used a piece of stiff wire like a coat hanger to hook onto them to stop them falling off and into the engine when the plate is removed.
Take the nuts off and knock the arm off, there is a key on the shaft, so don't just beat on the rod to get the arm off, it will not slide out, been there destroyed that. Remove the arm first, then the key first then you will be good to go.